Abstract

We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π±N using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π+π mass distribution from the observed decay into J/ψπ+π shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=−1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ψπ+π is determined to be 71±28(stat)±39(syst) pb.

Original languageEnglish
Pages (from-to)334-340
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume783
DOIs
StatePublished - 10 Aug 2018

Funding

FundersFunder number
Israel Academy of Sciences and Humanities
Center for Scientific Review
Japan Society for the Promotion of Science
Ministry of Science and Technology, Taiwan
Bundesministerium für Bildung und Frauen
California Department of Fish and Wildlife
Seventh Framework Programme1506416
Ministry of Education, Culture, Sports, Science and Technology
National Science Foundation1506416, 1812377, 283286
Fundació Catalana de Trasplantament123600/2011, CERN/FIS-NUC/0017/2015, 116376/2010
Ministry of Education, Youth and ScienceLG13031
Narodowym Centrum Nauki2017/26/M/ST2/00498

    Keywords

    • COMPASS
    • Exotic charmonia
    • Photoproduction
    • Tetraquark
    • X(3872)

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